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There are many different brands of smoke alarms available on the market, but they fall under two basic types: ionization and photoelectric.
It cannot be stated definitively that one is better than the other in every fire situation that could arise in a residence. Because both ionization and photoelectric smoke alarms are better at detecting distinctly different, yet potentially fatal fires, and because no one can predict what type of fire might start in a home, the U.S. Fire Administration (USFA) recommends that every residence and place where people sleep be equipped with:
In addition to the basic types of alarms, there are alarms made to meet the needs of people with hearing disabilities. These alarms may use strobe lights that flash and/or vibrate to assist in alerting those who are unable to hear standard smoke alarms when they sound.
Install smoke alarms on every level of your home, including the basement. Many fatal fires begin late at night or early in the morning, so the U.S. Fire Administration recommends installing smoke alarms both inside and outside of sleeping areas.
Since smoke and many deadly gases rise, installing your smoke alarms at the proper level will provide you with the earliest warning possible. Always follow the manufacturer's installation instructions.
Is your smoke alarm still working? Smoke alarms must be maintained! A smoke alarm with a dead or missing battery is the same as having no smoke alarm at all.
A smoke alarm only works when it is properly installed and maintained. Depending on how your smoke alarm is powered (9-volt, 10-year lithium, or hardwired), you'll have to maintain it according to the manufacturer's instructions. General guidelines for smoke alarm maintenance:
Smoke alarm powered by a 9-volt battery:
Smoke alarm powered by a 10-year lithium (or "long life") battery:
Smoke alarm that is hardwired into the home's electrical system: